题目内容

3.
计算
$\frac{4}{11}$×$\frac{5}{6}$×33

$\frac{5}{12}$×36×$\frac{2}{3}$

$\frac{7}{11}$×$\frac{2}{3}$×$\frac{3}{14}$

15×$\frac{8}{9}$×$\frac{3}{10}$

$\frac{1}{3}$×$\frac{5}{8}$×$\frac{4}{5}$
$\frac{2}{9}$×$\frac{3}{20}$×18$\frac{7}{12}$×$\frac{60}{11}$×44$\frac{9}{8}$×$\frac{4}{5}$×$\frac{35}{27}$60×$\frac{51}{38}$×$\frac{57}{34}$.

分析 (1)(8)根据乘法交换律结合律简算;
(2)把36分成12×3,再根据乘法结合律简算;
(3)(4)(5)(7)根据乘法结合律简算;
(6)把19分成2×9,再根据乘法结合律简算;
(9)根据乘法结合律约分即可.

解答 解:(1)$\frac{4}{11}$×$\frac{5}{6}$×33
=($\frac{4}{11}$×33)×$\frac{5}{6}$
=12×$\frac{5}{6}$
=10

(2)$\frac{5}{12}$×36×$\frac{2}{3}$
=$\frac{5}{12}$×12×3×$\frac{2}{3}$
=5×2
=10

(3)$\frac{7}{11}$×$\frac{2}{3}$×$\frac{3}{14}$
=$\frac{7}{11}$×($\frac{2}{3}$×$\frac{3}{14}$)
=$\frac{7}{11}$×$\frac{1}{7}$
=$\frac{1}{11}$

(4)15×$\frac{8}{9}$×$\frac{3}{10}$
=15×($\frac{8}{9}$×$\frac{3}{10}$)
=15×$\frac{4}{15}$
=4

(5)$\frac{1}{3}$×$\frac{5}{8}$×$\frac{4}{5}$
=$\frac{1}{3}$×($\frac{5}{8}$×$\frac{4}{5}$)
=$\frac{1}{3}$×$\frac{1}{2}$
=$\frac{1}{6}$

(6)$\frac{2}{9}$×$\frac{3}{20}$×18
=$\frac{2}{9}$×9×2×$\frac{3}{20}$
=2×$\frac{3}{10}$
=$\frac{3}{5}$

(7)$\frac{7}{12}$×$\frac{60}{11}$×44
=$\frac{7}{12}$×($\frac{60}{11}$×44)
=$\frac{7}{12}$×240
=140

(8)$\frac{9}{8}$×$\frac{4}{5}$×$\frac{35}{27}$
=($\frac{9}{8}$×$\frac{35}{27}$)×$\frac{4}{5}$
=$\frac{25}{24}$×$\frac{4}{5}$
=$\frac{5}{6}$

(9)60×$\frac{51}{38}$×$\frac{57}{34}$
=30×$\frac{51}{19}$×$\frac{57}{34}$
=15×$\frac{51}{19}$×$\frac{57}{17}$
=15×3×3
=15×9
=135

点评 完成本题要注意细心分析式中数据,然后快速准确得出答案.

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